from flask import Flask
app = Flask(__name__)
@app.route('/user/<id>')
def index1(id):
    if id == '1':
        return 'python'
    if id == str(2):
        return 'flask'
    if int(id) == 3:
        return 'django'
    return 'Hello World'

if __name__ == '__main__':
    app.run()